Describe the bug
When opening a FITS file with file browser UI popup, the "File Information" and "Header" previews display the * character as a . character in the BUNIT keyword. E.g. if 'BUNIT = K (Ta*)' in the header, it shows up as 'BUNIT = K. (Ta.)' and 'Pixel unit = K. (Ta.)' in the frontend.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'File' --> 'Open Image'
2. Click on any FITS file where the BUNIT keyword has a * character.
3. Scroll down to 'Pixel unit' in 'File Information' and 'BUNIT =' in 'Header'
4. See error.

Expected behavior
The frontend should display the * character properly. E.g. if 'BUNIT = K (Ta*)' in the header, it shows up as 'BUNIT = K (Ta*)' and 'Pixel unit = K (Ta*)' in the frontend.

Screenshots or videos

Platform info (please complete the following information):

• OS: Linux RHEL
• Browser: Mozilla Firefox
• Browser version: 128.4.0esr (64-bit)
• CARTA version: 4.1.0 (18 Jan 2024)